基于PFC方法的粗粒土三轴试验尺寸效应研究

发布时间：2018-01-14 12:00

本文关键词：基于PFC方法的粗粒土三轴试验尺寸效应研究　出处：《公路工程》2014年02期 　论文类型：期刊论文

更多相关文章： 粗粒土 PFCD 尺寸效应 大三轴试验

【摘要】：粗粒土是工程建设过程中经常遇到的一类土,由于室内仪器限制,通常将其按一定条件缩尺后进行室内大三轴试验,进而推算原级配土的强度特性。缩尺后替代级配与原级配存在着缩尺条件、尺寸效应等问题。在某高速公路大三轴试验数据基础上,运用PFC2D软件,将600×300 mm样本经等质量替代法缩尺,比较了缩尺后不同尺寸样本的应力-应变曲线。结果表明:PFC2D可以很好的模拟三轴试验;缩尺后的样本应变模量降低,且随着样本尺寸的增大而增大,样本的抗剪强度也存在差异;等质量替代法对缩尺后样本的尺寸大小有限制;当样本颗粒级配相同时,不同尺寸样本在峰前阶段的尺寸效应不明显。
[Abstract]:Coarse grained soil is a kind of soil which is often encountered in the process of engineering construction. Due to the limitation of indoor instruments, it is usually used for laboratory triaxial tests after scaling according to certain conditions. Then the strength characteristics of the original gradation soil are calculated. There are some problems such as the scaling condition and the size effect between the replacement gradation after scaling and the original gradation. On the basis of the large triaxial test data of a certain expressway, the software PFC2D is used. The stress-strain curves of 600 脳 300mm samples with different sizes are compared by the equivalent mass substitution method. The results show that the three-axis test can be well simulated by using the w / PFC2D method. The strain modulus of the sample after scaling decreases and increases with the increase of the sample size, and the shear strength of the sample is also different. The size of the sample after the scale is limited by the equal mass substitution method. When the particle gradation of the sample is the same, the size effect of different size samples in the pre-peak stage is not obvious.
【作者单位】：吉林大学建设工程学院;重庆市地质勘查开发局南江水文地质工程地质队;
【基金】：地质灾害防治与地质环境保护国家重点实验室开放基金项目(GZ2009-21) 国家自然科学基金青年基金项目(41302218)联合资助
【分类号】：U412.22
【正文快照】： 0前言粗粒土在工程上有其天然优势,比如抗剪强度和承载力高、透水性好、压缩性低等优良的工程特性。粗粒土本身是一种散体物质,颗粒与颗粒之间不存在粘结力,只存在点与点接触力。随着国家机械化程度大幅提升,工程质量进一步提高,在填方材料、地基土的换填、大坝坝基材料填充、

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